Constraints on a stochastic background of primordial magnetic fields with WMAP and South Pole Telescope data

Paoletti, D.; Finelli⋆, F.

doi:10.1016/j.physletb.2013.08.065

Cited by 44 publications

(47 citation statements)

References 50 publications

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“…We also note that the magnetic field upper limit at megaparsec scales derived from just the scalar mode magnetic CMB trispectrum is already several times better than the upper limit from the magnetic CMB power spectrum combining scalar, vector and tensor modes: 3.4 nG from Planck mission 2013 data [29] and (∼ 2-6 nG) from WMAP data [30][31][32][33]. Non-Gaussian correlations like the bispectrum and especially the trispectrum are better able to constrain primordial cosmological magnetic fields than the CMB power spectrum.…”

Section: Discussionmentioning

confidence: 99%

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Primordial magnetic field limits from the CMB trispectrum: Scalar modes and Planck constraints

2014

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Cosmic magnetic fields are observed to be coherent on large scales and could have a primordial origin. NonGaussian signals in the cosmic microwave background (CMB) are generated by primordial magnetic fields as the magnetic stresses and temperature anisotropy they induce depend quadratically on the magnetic field. We compute the CMB scalar trispectrum on large angular scales, for nearly scale-invariant magnetic fields, sourced via the Sachs-Wolfe effect. The trispectra induced by magnetic energy density and by magnetic scalar anisotropic stress are found to have typical magnitudes of approximately 10 −29 and 10 −19 , respectively. The scalar anisotropic stress trispectrum is also calculated in the flat-sky approximation and yields a similar result. Observational limits on CMB non-Gaussianity from the Planck mission data allow us to set upper limits of B0 0.6 nG on the present value of the primordial cosmic magnetic field. Considering the inflationary magnetic curvature mode in the trispectrum can further tighten the magnetic field upper limit to B0 0.05 nG. These sub-nanoGauss constraints from the magnetic trispectrum are the most stringent limits so far on the strength of primordial magnetic fields, on megaparsec scales, significantly better than the limits obtained from the CMB bispectrum and the CMB power spectrum.

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Section: Discussionmentioning

confidence: 99%

“…Furthermore, blue spectral indices, on large scales, are strongly disfavoured by many observational constraints on primordial magnetic fields like the CMB power spectra [29][30][31][32][33].…”

Section: Primordial Magnetic Fieldmentioning

confidence: 99%

Primordial magnetic field limits from the CMB trispectrum: Scalar modes and Planck constraints

2014

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“…On these scales the primary CMB is suppressed by Silk damping therefore magnetic vector mode dominates over CMB angular power spectrum as shown in [14]. The vector contribution to τ ab is given by:…”

Section: The Vector Contributionmentioning

confidence: 98%

CMB anisotropies generated by a stochastic background of primordial magnetic fields with non-zero helicity

Ballardini

Finelli⋆

Paoletti

2015

J. Cosmol. Astropart. Phys.

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We consider the impact of a stochastic background of primordial magnetic fields with nonvanishing helicity on CMB anisotropies in temperature and polarization. We compute the exact expressions for the scalar, vector and tensor part of the energy-momentum tensor including the helical contribution, by assuming a power-law dependence for the spectra and a comoving cutoff which mimics the damping due to viscosity. We also compute the parity-odd correlator between the helical and non-helical contribution which generate the T B and EB cross-correlation in the CMB pattern. We finally show the impact of including the helical term on the power spectra of CMB anisotropies up to multipoles with ∼ O(10 3 ).

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“…Constraints have been derived using the CMB temperature and polarization power spectra [32,33], Faraday rotation [34] and studying its non-Gaussian correlations, considering the bispectrum [35], as well as the trispectrum [36]. The upper bounds that are established are between a few and tenth of nano Gauss.…”

Section: −9mentioning

confidence: 99%

Warm inflation in presence of magnetic fields

Piccinelli

Sánchez

Ayala

et al. 2013

AIP Conference Proceedings

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We study the effects of primordial magnetic fields on the inflationary potential in the context of a warm inflation scenario. The model, based on global supersymmetry with a new-inflation-type potential and a coupling between the inflaton and a heavy intermediate superfield, is already known to preserve the flatness required for slow-roll conditions even after including thermal contributions. Here we show that the magnetic field makes the potential even flatter, retarding the transition and rendering it smoother.

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Constraints on a stochastic background of primordial magnetic fields with WMAP and South Pole Telescope data

Cited by 44 publications

References 50 publications

Primordial magnetic field limits from the CMB trispectrum: Scalar modes and Planck constraints

Primordial magnetic field limits from the CMB trispectrum: Scalar modes and Planck constraints

CMB anisotropies generated by a stochastic background of primordial magnetic fields with non-zero helicity

Warm inflation in presence of magnetic fields

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